<!doctype <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>css3作业</title>
<p>第一个p标签</p>
<h1>第一个标签</h1>
<h2>张峰华的作业<h2>
<style>
    body{
        background: black
    }
    p{
        color:green
        
    }
    h1{
        color:yellow
    }
    h2{
        color:blue
    }
    div{
            height: 90px;
            width: 90px;
            background: red;
            margin: 8px;
            float: right;
        }
        div.a1{
           background: white;
        }
        #zfh{
            background: rgb(0, 0, 0);
        }
        
    </style>
</head>
<body>
        <div id="zfh"></div>
        <div class="a1"></div>
        <div id="zfh"></div>
        <div class="a1"></div>
        <div id="zfh"></div>
        <div class="a1"></div>
</body>
</html>